Nine people who were hired to whip young millionaire founders into shape before the company got too big

Getty / Scott Olson

It's not hard to find startups led by 20-something founders in Silicon Valley.

But as the startups start to grow into multi-billion-dollar companies, even the most talented tech wunderkinds often need a seasoned executive partner who can provide "adult guidance" at some point down the road.

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These 9 people were hired by some of the biggest tech companies to provide that type of counsel to a less experienced founder.